.frame {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  border-radius: 2px;
  box-shadow: 1px 2px 10px rgba(0, 0, 0, 0.3);
  background: rgb(246, 232, 215);
  background: -moz-radial-gradient(center, ellipse cover, rgb(246, 232, 215) 0%, rgb(218, 190, 155) 100%);
  background: -webkit-radial-gradient(center, ellipse cover, rgb(246, 232, 215) 0%, rgb(218, 190, 155) 100%);
  background: radial-gradient(center, ellipse cover, rgb(246, 232, 215) 0%, rgb(218, 190, 155) 100%);
  overflow: hidden;
}

.floor {
  position: absolute;
  height: 156px;
  background-color: #232323;
  width: 100%;
  bottom: 0;
}

.invisible-men {
  animation: fade-in 0.8s ease-in-out 1s;
  animation-fill-mode: both;
}

.leg {
  position: absolute;
  top: 0px;
  left: 147px;
  width: 151px;
  height: 245px;
  transform-origin: 50% 0;
}

.shoe {
  position: absolute;
  width: 151px;
  height: 128px;
  left: 0;
  bottom: 0;
  background: url("https://100dayscss.com/codepen/doc-martens.svg") center center no-repeat;
  transform-origin: 0 95%;
}

.left {
  animation: leg-swing 2s ease-in-out infinite;
}
.left .shoe {
  animation: shoe-turn 2s ease-in-out infinite;
}

.right {
  animation: leg-swing 2s ease-in-out 1s infinite;
}
.right .shoe {
  animation: shoe-turn 2s ease-in-out 1s infinite;
}

@keyframes leg-swing {
  0%, 100% {
    transform: rotate(-22deg);
  }
  50% {
    transform: rotate(40deg);
  }
}
@keyframes shoe-turn {
  0%, 100% {
    transform: rotate(-10deg) translateY(-5px) translateX(10px);
  }
  25% {
    transform: rotate(0deg) translateY(0px) translateX(0);
  }
  50% {
    transform: rotate(10deg) translateY(-10px) translateX(10px);
  }
  75% {
    transform: rotate(0deg) translateY(-30px) translateX(0);
  }
}
@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}